C Si 
 1.0000000000000000
     3.0711161428402445   -0.0000000000000000    0.0000000000000000
    -1.5355580714201222    2.6596645976721316    0.0000000000000000
     0.0000000000000000   -0.0000000000000000    4.9814336787052271
 C   Si 
   2   2
Selective dynamics
Cartesian
 -0.0000000153555816  1.7731097406469705  2.4886336059534147   T   T   T
  1.5355580560645414  0.8865548747562597 -0.0020832333992005   T   T   T
 -0.0000000153555816  1.7731097406469705  4.3658191359449754   T   T   T
  1.5355580560645414  0.8865548747562597  1.8751022965923638   T   T   T